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Income Taxes - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Jan. 01, 2017
Income Tax Contingency [Line Items] |  |  |  |
Federal statutory tax rate |  |  | 35.00% |
Revaluation of net deferred tax assets |  | $ 5,500,000 |  |
Write-off of deferred tax assets related to share based compensation |  |  |  | $ 500,000
Valuation allowance |  | 876,000 | $ 876,000 | 0
Unrecognized tax benefits |  | 0 | 0 | $ 0
Unrecognized tax benefits, period |  |  |  | Over the next 12 months
Accrued interest or penalties |  | 0 | $ 0 | $ 0
Earliest Tax Year [Member] | Federal [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax returns in period |  |  | 2014 |
Earliest Tax Year [Member] | State and Local [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax returns in period |  |  | 2013 |
Goodwill [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Provision related to non-deductible goodwill impairment |  |  | $ 1,700,000 |
TCJA [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Revaluation of net deferred tax assets |  |  | 5,500,000 |
California Enterprise Zone Tax Credits [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Provision for incomes taxes, excluding federal income tax benefit |  | 600,000 | 900,000 |
Valuation allowance |  | $ 900,000 | $ 900,000 |
Tax credits carry forward latest expiration year |  |  | 2024 |
Subsequent Event [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Federal statutory tax rate | 21.00% |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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